bergstrom



Oct. 4, 1955 c. N. BERGSTROM HOLDING SEAL FOR CRANKCASE GASKETS OriginalFiled June 11. 1949 m, m m

//\/1/E/\/ 7-5; CARL NbERGsTROM TTUF/VE/ United States Patent "iceReissue, If; egg:

the ferrule 17. The end 21 is preferably flared to a thin v 244,65 edgeto facilitate the insertion of the screw point 22. HOLDING SEAL FORCRAN'KCA E A KE In the use of this device, it is only required tmountthe gasket 16 on the flange 12 and then drop a fe e 17 Carl BergstmmPortland into each pair of holes 14 and 15 until the flange 18 rests 0No. 2,639,832, dated May 26, 1953, Serial No. upon the gasket 16. Screws17-A are now pushed into 98,495, June 11, 1949. Application for reissueAugust the ferrule ends 21 and held by means of the beads 20.

1953, Serial No. 375,313 No difficulty will be encountered in startingthe screws 5 Claim (CL 21F) 17-A and then sending them home by means ofa speed wrench or power driver.

Matter enclosed in heavy brackets appears in the The ferrule is flowedby the tightening action to the forms I10 P Of \his reissue p form shownin Fig. 3 in which the clearance is exaggerated.

original patent but f Printed in italics indicates the addifions Inpractice the ferrule 17 fills up the clearance space 23 and made byflows around the threads of the screws 17-A.

Should the crankcase be removed, the gasket is more Th1s mventronrelates generally to the automotive 1napt to come away intact with thecrank case as it is held dustry and particularly to a holding seal forcrankcase againstit by the various ferrules. I gaskets Referring toFigure 3 of the drawing, it is to be noted The lh object of lhvenhoh Isto provlde a means that the ferrule 17 has been deformed, as explainedherefor faclhtahhg the apphcahoh of crankcase hhd gasket inbefore, tofill the space 23 and the grooves of the screw to a motor thread to forma fluid seal. In Figure 2 of the drawing it is The Second object toInsure the ahghmeht of the holes to be noted that the ferrule extendsdownwardly a substanlh the crankcase and gasket and to protect thegasket tial distance below the flange 12. Thus, it will be underarouhd hl stood that in the event the space 23 is less than that indi- The thhdoblect is to lhshre a more Perfect seal around 25 cated in Figure 3 or,alternatively, if the ferrule is longer 2;: bolts and to renderunnecessary the use of lock wash or thicker than indicated, the excessmaterial of which the ferrule is formed will be forced outwardly betweenthe The fohrth object 15 to uhhze h h means as bolt head 17-A and thecrankcase flange. Thus, it will scrhw retamer to hold the Screws mpchsmoh for the apph' be understood that the length of the ferrule isnot critical, canon of a speed wrehch or a power i it being requiredonly that the ferrule extend through the These h other oblhcts are,accohhphshhd 1h the'mhhher combined thickness of the gasket and theflange a distance set forth lhhle fohohhhghpeclhcahohhs Illustrated mthe sufficient to result in its deformation to form a fluid seal accomanying drawmg, n whlchz. when the bolt has been tightened. In otherwords, the 1 1s a fragmentary perspective. showmg length of thecylindrical portion 17 must be greater than of h motor base gashe} hhdcrhjhhcase' the ultimate combined thickness of the compressed gasket 21s a fragmentary sechoh showmg relahoh of and the flange, i. e. afterthe bolt has been tightened. ig g as the crankcase and gasket are belhgput mto It will be further understood that the ferrule may be employedin the securing together of rigid elements, as com- 3 15 law shhhar tobut shhwlhg the crank pared with the resilient gasket 16. For example, asingle h 1h Poslhoh agalhst the motor base whh the bolt 40 metal platemay be considered equivalent to the combination of gasket 16 and flange12. If such a plate is to be 1s a Perspechve of the ferrule whh Pansbroken secured to a second member, such as the motor base 10, y Insechoh' the ferrule is inserted through the plate to retain the screwLlke numbers of reference hefer to the same or Shhhhr prior toattachment to the base 10, and it is required that parts thrhughoutSeveral the ferrule 17 must be longer than the thickness of saidReferring m detah to the drawmg thehe shown the plate in order for theferrule to deform under the pressure lower portion 10 of a motor base toWhlCll is to be atof the tightened screw to form a fluid 0L tached acrankcase 11 by of Its flange In practice, the ferrule is provided insufficient length Around the flange 12 are hsposed a Phhhhty of screwsto accommodate a substantial range of thicknesses of such 13 which passthrough holes 14 in the flange 12 and members 16 and 12. The ferrule maythen be shortened through holes m the cork or composlhoh gasket ah toany desired length merely by cutting off the unwanted of m portionopposite the flange 18.

There 1s always provided around the screws 13 a con- 1 cl siderableamount of clearance space as the parts are inter- 1, A f 1 fo use itemporarily mmi a f t changeable and a workman, having but two hands,has ing member by its shank portion while fastening machine them veryfull when putting a crankcase and its gasket in parts together byinsertion and fixedly securing a fasposition. tening member in alignedopenings in said machine parts,

Shellac or other stick seal is often used on both sides Said ferrulecomprising a cylindrical Portion of mof the gasket and this tends tohold the gasket in place able Plastic resin having bol'fi which is p011twardly toward one end to provide an entering portion on thecrankcase flange 12.

However, once the gasket touches the base 10 there is for the shankportion of the fastening member, the other apt to be a shifting of thegasket 16 on the flange 12. end havmg an outwardly exiehdmg. flange a hMy device consists of a ferrule 17 of plastic materials ehgagmg hhhularbead extehdlhg. radlahy oh the h I: such as the phenol derivatives] orlead or other Soft side of said ferrule bore for fIlCllOIlfi-lengagement wlth ductile material the shank portion of the fasteningmember whereby the e ferr e 17 1 formed on e end a flange 18 w fasteningmember is temporarily retained by said ferrule d (1 th 1 19 h h H th hfl upon 111881111011 of the fastening member theremto. W1 alfnu {lugs w5 en t e ange 2. In combination; a first member of predetermined andimprove lt h lding and eahug aCtl nthickness adapted for being securedto a second member,

The ferru e 17 has formed in h Side thereof, a bead a screw extendingthrough said first member for threaded engagement with said secondmember, and a cylindrical ferrule of deformable plastic material mountedon the 20 which may be continuous or merely broken or even single pointsor projections at two or more places around thickness adapted for screwand tapering to a thin edge toward the head end of the screw and havinga radial flange at its opposite end, said flange being disposed betweensaid members with the cylindrical portion extending through said firstmember, and the length of the cylindrical portion of the ferrule beinggreater-than the thickness of said first member, whereby when the screwis drawn up tight the cylindrical portion of said ferrule is deformed toform a seal about said screw, the cylindrical portion of theferrulebeing provided with a thread engaging projectionextendingradially inwardly thereof whereby the screw is snpportd by'theferrule.

3. In combination; a first member of predetermined being secured to asecond member, a screw extending through saidfirst member for threadedengagement with said second member, and a cylindrical fei rule ofdeformable plastic material mounted on the screw and having a radialflange at one end, said flange being disposed between said members withthe cylindrical portion extending through said first member, and thelength of the cylindrical portion of the ferrule being greater than thethicknessof said first member, whereby when the screw is drawnup tightthe cylindrical portion of said ferrule is deformed to form a seal aboutsaid screw, the cylindrical portion of the ferrule being provided withathread engaging projection extendingradially inwardlythereof whereby thescrew is supported by the ferrule.

4. In combination; a fastening member haying a threaded shank and aheaded end, first and second members having aligned openings therein forreceiving the shank of the fastening member, a ferrule comprising a bodyof deformable plastic material having a hollow cylindricalshank-retaining portion and a radial flange on one end thereof, thecylindrical portion extending throughthe opening in the first memberwith but little space between its exterior face and the wall of saidlatter opening and with the flange interposed between the first memberand portion 'having a continuous circumference surrounding the fasteningmember shank and having a length greater than the thickness of the firstmember, the fastening member shank extending through the hollowcylindrical portion with its headed end at that end of the cylindricalportion of the ferrule that is opposite the flange thereof, thecylindrical portion of the ferrule frictionally engaging the fasteningmember shank whereby to secure the 'ferrule and fastening member in thefirstmernber, whereby when the fastening member shank is secured to thesecond memberand the first and second members are drawn together by saidfasteningmember the cylindrical portion ofthe ferrule is buckled "intothe opening in said first member to form afluid seal between said shankand the opening in the first member.

5.'=In combination," a fastening member having a threaded shank and aheaded end, first and second members havinga gasket interposedtherebetween and all second member, the cylindrical quantum;

penings therein for receiving the shank membana ferrule comprising abody of deformable plastic material having a hollow cylindricalshank-retaining portion and a radial flange on one end thereof, thecylindrical portion extending through the aligned openings in the gasketand first member with but little space between its exterior face and thewall of said latter aligned openings and with the flange interposedbetween the gasket and second member, the cylindrical portion having acontinuous surface surrounding the fastening membershank and having alength greater than the combined thickness of the gasket and firstmember, the fastening member shank extending having aligned v throughthe hollow cylindrical portion with its headed end at that end of thecylindrical portion of the ferrule that isopposite the flange thereof,the cylindrical portion of the ferrule frictionally engaging thefastening member shank whereby to secure the ferrule and fastening memlerjn the al ignedflpmit gs in, the.gasket.and first member ,and .-to,prergent displacement of .said openings, whereby when the fasteningmember shank is secured to thesecqnd ,memb enandjhe said .gasket andfirst and second members are drawn together by said fastening member thecylindrical portion of the ferrule is buckled intosaid,aligned.o en ingsin the gasketand firstmember to .f ormpfiuid ,sealbetweenlsaid shank,and the wall of said la'tteropenings.

.llsfe jucps ,Qitedinthefile .o hi P en or the original patent UN TETAJT J AI NTS 233,5:79 Varlot Oct. 19, 1880 813,575 Nichols Feb. 27,1906 947,185 :McBean Jan. 18, .1910 :1;08 3,350 zDavis Jan. 6, 19141,356,404 Robinson Oct. 19, 1920 1,515,996 Buchanan Nov. 18, 19241,862,320 :Ruef June 7, 1932 21,873,894 Kimball Aug. 23, 1932 1,959,607Anderson May 22, 1934 2,030,088 Y0ung Feb. 11, 1936 --2,09Q,3:58"Robertson Sept. 7, 1937 2,150,080 .tRawlings- Mar. v17, 1939 2,159,346Welch May 23, 1939 2324;1412 :Eklund July 1-3, 1943 2,343,983 KnowltonMar. 14, 1944 2,352,487 McNamara June 27, 1944 2,376,072 Miller May 15,1945 12,425,209 .Snyderet a1. Aug. .5, 1947 2,491,085 iBurrows Dec. 13,1949 -PA ENTS German Nov. 15, 1900 1 OTHER REFERENCES .B a t q 9.. .Rsemend .PQ -Wa Prodw Pu y Pr qu .ifi gsinee i tsts memhs 1 12 -8 .R

